Use a ratio to find out that x/190.2 = 74.5/100
hope this helps
Nitrogen is 5 valence electrons
oxygen is 6 valence electrons
fluorine is 7 electrons
Idk look it up on another website
Sodium, hydrogen, carbon, and oxygen
So the equation is balanced, meaning they have the smallest amounts of each element in the reactants to create the products.
So, 2 moles of H2S (the coefficient) contributes to 2 moles Ag2S, which is why the ratio is 2:2.
I hope that made sense.